78122867 has 2 divisors, whose sum is σ = 78122868. Its totient is φ = 78122866.

The previous prime is 78122843. The next prime is 78122893. The reversal of 78122867 is 76822187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78122867 - 2¹⁰ = 78121843 is a prime.

It is a super-2 number, since 2×78122867² = 12206364696599378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78122827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39061433 + 39061434.

It is an arithmetic number, because the mean of its divisors is an integer number (39061434).

Almost surely, 2^78122867 is an apocalyptic number.

78122867 is a deficient number, since it is larger than the sum of its proper divisors (1).

78122867 is an equidigital number, since it uses as much as digits as its factorization.

78122867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 78122867 is about 8838.7141033071. The cubic root of 78122867 is about 427.4900960965.

The spelling of 78122867 in words is "seventy-eight million, one hundred twenty-two thousand, eight hundred sixty-seven".